ECB 3D Printing has designed wheels for 1.55 tires and 12mm hex. These measure approximately 21mm (.830") wide.  
 
These can be ordered in 2 offsets. 
We have the +1.35 offset that has a deep hex side offset to tuck the wheels more under the truck body. 
We also make a -1.65 offset that has a little more depth to the outside face of the wheel to give the appearance of a wider wheel.
 
The wheels are designed to look like vintage heavy duty wheels with the 8 lug pattern.
 
These come in sets of 4 wheels, 4 outer faces, 4 beadlock rings, 4 inner faces. These also come with 32 scale screws to represent the lug nuts. The included 2.5mm screw is the "tool" to tighten or loosen the scale hardware (use a pin vise or pliers on the 2.5mm screw and then the hex can be used as a socket on the scale hardware). 
 
The printed parts come in black PETG-CF for a more rugged use.